Harley Davidson Progressive Suspension Air Dragger Shock suspension Compressor kit 30-5300 for Tail Dragger and all progressive suspension bar mounted fully digital air suspension adjustable whilst riding for ride height / payload , specially designed by us for Baggers with Tail Dragger kit or air ride suspension systems mounts in r/h fairing lower pocket easy to fit allows rider to adjust rde height/payload settings with a chrome bar mounted very cool progressive suspension deluxes controller modified by us available as an upgrade for your existing suspension or available as a full kit too ,electrically operated valves adjust ride height / payload and a simple bar graph colored led display displays your pressure ,looks and works great -see our youtube video for full details as used and modified by us for any bike Dyna/ Dresser or softail to suit your ride .this is an additional add on to your existing Progressive air shocks